The effect of Ag diffusion on properties of YBa2Cu3O7−x thin films produced by electron beam deposition techniques

Görür, O.; Küçükömeroğlu, Tevfik; Terzioğlu, C.; Varılcı, A.; Altunbaş, M.

doi:10.1016/j.physc.2004.11.003

Cited by 12 publications

(8 citation statements)

References 20 publications

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“…The H V -F curve behavior shows that the H V decreases non-linearly as the applied load increases up to 3 N, beyond which the curves tend to attain saturation (nearly plateau) region. This non-linear behavior is also observed for (Bi,Pb)-2223 phase [12][13][14][15][30][31][32][33][34] and it is known as indentation size effect (ISE). The ISE behavior can be explained qualitatively on the basis of penetration depth of the indenter.…”

Section: Characterization and Investigationmentioning

confidence: 89%

“…The previous studies showed that T c values are gradually decreased with the increase of R 3+ content [10][11][12][13][14][15]. The effect of partial substitution of Sm and Eu at Ca site in (Bi,Pb)-2223 system on the superconducting, microstructure, and mechanical properties was studied [12][13][14][15][16]. It was found that the volume fraction of (Bi,Pb)-2223 phase decreases with increasing Sm content.…”

Section: Introductionmentioning

confidence: 97%

“…The effect of chemical substitution/addition on Vickers microhardness for (Bi,Pb)-2223 phase was studied by many groups [12][13][14][15][32][33][34]. It was found that the substitution of Sm at Ca site increases H V due to the enhancement in grain connectivity, and the modified proportional specimen resistance model was found to be the most successful model describing the load independent microhardness [32].…”

Section: Introductionmentioning

confidence: 99%

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Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

et al. 2016

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Abstract:The effect of the partial substitution of Ca 2+ by Ho 3+ ions on the electrical and mechanical properties of the superconducting phase (Bi,Pb)-2223 was studied. Superconducting samples of the type (Bi 1.8 Pb 0.4 )Sr 2 Ca 2.1−x Ho x Cu 3.1 O 10+δ were prepared by solid-state reaction technique under ambient pressure, and characterized by means of X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The superconducting transition temperature T c and pseudogap temperature T * were estimated from electrical resistivity measurements, while the critical current density J c was determined from I-V curves. The electrical resistivity data were discussed according to bipolaron model in the absence of thermally excited individual polarons. The sample with x = 0.025 showed the highest phase volume fraction, T c , and J c . Room temperature Vickers microhardness measurements were carried out at different applied loads (0.25-5 N) in order to investigate the performance of the mechanical properties of (Bi 1.8 Pb 0.4 )Sr 2 Ca 2.1−x Ho x Cu 3.1 O 10+δ phase. It was found that all the samples exhibit normal indentation size effect (ISE). The Vickers microhardness number H V increased as x increased from 0 to 0.025. The experimental results were discussed in view of Meyer's law, Hays-Kendall (HK) approach, elastic/plastic deformation (EPD) model, and proportional specimen resistance (PSR) model. The load independent (true) microhardness of (Bi 1.8 Pb 0.4 )Sr 2 Ca 2.1−x Ho x Cu 3.1 O 10+δ superconducting samples showed identical behavior to that of the PSR model.

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Section: Characterization and Investigationmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

et al. 2016

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“…They showed that silver doping results in quite different behavior, which depends on many factors, such as the growth method [ 12 ], concentration of silver [ 13 , 14 , 15 ], and type of substrate [ 14 , 16 ]. It is currently known that doping silver into YBa 2 Cu 3 O 6+x (YBCO) improves the growth properties of the films [ 13 ] and enhances the incorporation of oxygen [ 17 , 18 ], which, in turn, can lead to improved transport, mechanical, and even, in some cases, superconducting properties [ 18 , 19 , 20 ]. In addition, silver has a beneficial influence on the current transport across grain boundaries [ 14 , 21 , 22 ], which is of considerable interest for metal-based templates due to their granular structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Silver Doping on the Superconducting and Structural Properties of YBCO Films Grown by PLD on Different Templates

et al. 2022

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We report the local structural and superconducting properties of undoped and Ag-doped YBa2Cu3O6+x (YBCO) films with a thickness of up to 1 µm prepared by pulsed laser deposition on SrTiO3 (STO) single crystals and on ion-beam-assisted deposition (IBAD) and rolling-assisted biaxially textured substrate (RABiTS)-based metal templates. X-ray diffraction demonstrates the high crystalline quality of the films on both single crystalline substrates and metal-based templates, respectively. Although there was only a slight decrease in Tc of up to 1.5 K for the Ag-doped YBCO films on all substrates, we found significant changes in their transport characteristics. The effect of the silver doping mainly depended on the concentration of silver, the type of substrate, and the temperature and magnetic field. In general, the greatest improvement in Jc over a wide range of magnetic fields and temperatures was observed for the 5%Ag-doped YBCO films on STO substrates, showing a significant increase compared to undoped films. Furthermore, a slight Jc improvement was observed for the 2%Ag-doped YBCO films on the RABiTS templates at temperatures below 65 K, whereas Jc decreased for the Ag-doped films on IBAD-MgO-based templates compared to undoped YBCO films. Using detailed electron microscopy studies, small changes in the local microstructure of the Ag-doped YBCO films were revealed; however, no clear correlation was found with the transport properties of the films.

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“…To improve the superconducting properties, partial substitution and diffusion have been investigated extensively [1][2][3][4][5][6][7][8][9]. Görür et al [10,11] investigated the effect of Ag diffusion on the properties of YBa 2 Cu 3 O 7−x (YBCO) thin films produced by electron-beam deposition techniques and bulk samples. They found that, for an Ag-doped sample, the critical transition temperature and the critical current density were increased while the room-temperature resistivity values were decreased in comparison with those of undoped YBCO.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the diffusion coefficient of Au in Bi-2223 superconductors

Öztürk¹,

Küçükömeroğlu²,

Terzioğlu³

2007

J. Phys.: Condens. Matter

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Undoped Bi-2223 samples were prepared using a conventional solid-state reaction method. Doping of Au in Bi-2223 was carried out by means of diffusion from an evaporated Au film on pellets. We have investigated the effect of Au diffusion and diffusion-annealing duration on the microstructure and superconducting properties of Au-doped samples by performing x-ray diffraction (XRD), scanning electron microscopy (SEM), dc resistivity and critical current density measurements. Gold diffusion in Bi1.8Pb0.35Sr1.9Ca2.1Cu3Oy has been studied over the temperature range 500–800 °C using the technique of successive removal of thin layers and the measurements of lattice parameters from XRD patterns at room temperature. The diffusion doping of Bi-2223 by Au causes a significant increase of the lattice parameter c by about 0.19%. This observation is used for calculation of the Au diffusion coefficient in Bi-2223. The Au diffusion coefficient decreases as the diffusion-annealing temperature decreases. The temperature dependence of the Au diffusion coefficient in the range 500–800 °C is described by the relation D = 4.4 × 10−4exp(−1.08 eV/kBT). Au doping of the sample increased the critical transition temperature and the critical current density from 100 ± 0.2 to 104 ± 0.2 K and from 40 to 125 A cm−2, in comparison with those of undoped samples. The critical transition temperature and critical current density of Au-doped samples increased with increasing diffusion-annealing time from 10 to 50 h. Au doping of the sample also improved the surface morphology and increased the high-Tc phase ratio. The possible reasons for the observed improvement in superconducting properties of the samples due to Au diffusion are discussed.

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The effect of Ag diffusion on properties of YBa2Cu3O7−x thin films produced by electron beam deposition techniques

Cited by 12 publications

References 20 publications

Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

Effect of Silver Doping on the Superconducting and Structural Properties of YBCO Films Grown by PLD on Different Templates

Calculation of the diffusion coefficient of Au in Bi-2223 superconductors

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